AdBlockers are the range of tools aimed to remove advertisements from web-pages.
Tools to block advertisements include:
- Native in-browser tools (Opera's content blocker, IE9's tracking protection)
- Browser add-ons (AdBlock Plus)
- Greasemonkey scripts
- External applications (AdMuncher)
- System level IP/Domain filtration (via firewall, or editing Hosts file)
Adblockers have significant impact on website monetisation, and thus - are frequently tried to be circumvented by certain website authors / owners.